// Copyright (c) 2020 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

package io

import (
	"bufio"
	"io"
)

// ResettableWriter is a resettable writer.
type ResettableWriter interface {
	io.Writer
	Flush() error
	Reset(w io.Writer)
}

// ResettableWriterOptions are options for a resettable writer.
type ResettableWriterOptions struct {
	WriteBufferSize int
}

// ResettableWriterFn creates a resettable writer.
type ResettableWriterFn func(r io.Writer, opts ResettableWriterOptions) ResettableWriter

// defaultResettableWriterFn creates a default resettable writer.
func defaultResettableWriterFn() ResettableWriterFn {
	return func(r io.Writer, opts ResettableWriterOptions) ResettableWriter {
		return bufio.NewWriterSize(r, opts.WriteBufferSize)
	}
}
